/*
 * $Id$
 * Copyright 2007-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.paoding.rose.web.paramresolver;

import java.util.HashMap;
import java.util.Map;

import org.springframework.beans.BeanUtils;

/**
 * @author zhiliang.wang [qieqie.wang@paoding.net]
 */
public class ResolverInstances {

    private static Map<Class<?>, Resolver> instances = new HashMap<Class<?>, Resolver>();

    public synchronized static Resolver getInstance(Class<?> resolverClass) {
        Resolver resolver = instances.get(resolverClass);
        if (resolver == null) {
            resolver = (Resolver) BeanUtils.instantiateClass(resolverClass);
            instances.put(resolverClass, resolver);
        }
        return resolver;
    }

}
